syzbot


WARNING in btrfs_remove_chunk (2)

Status: upstream: reported C repro on 2023/12/20 03:26
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+456f974c2381aae882ce@syzkaller.appspotmail.com
First crash: 158d, last: 5h38m
Bug presence (1)
Date Name Commit Repro Result
2024/02/19 upstream (ToT) b401b621758e C [report] BUG: MAX_LOCKDEP_CHAINS too low!
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in btrfs_remove_chunk origin:upstream missing-backport C inconclusive 28 152d 436d 0/3 upstream: reported C repro on 2023/03/17 14:37
upstream WARNING in btrfs_remove_chunk btrfs C error inconclusive 228 12d 543d 0/26 upstream: reported C repro on 2022/11/30 08:16
linux-6.1 WARNING in btrfs_remove_chunk origin:lts-only C done 10 332d 422d 3/3 fixed on 2023/09/19 11:51
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/05/26 08:28 2h18m bisect fix linux-6.1.y job log (0) log
2024/04/21 08:10 2h40m bisect fix linux-6.1.y job log (0) log
2024/03/19 23:32 2h40m bisect fix linux-6.1.y job log (0) log

Sample crash report:
BTRFS info (device loop2): relocating block group 1048576 flags system
------------[ cut here ]------------
WARNING: CPU: 0 PID: 9188 at fs/btrfs/volumes.c:3220 btrfs_remove_chunk+0x1378/0x1904 fs/btrfs/volumes.c:3220
Modules linked in:
CPU: 0 PID: 9188 Comm: syz-executor286 Not tainted 6.1.78-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : btrfs_remove_chunk+0x1378/0x1904 fs/btrfs/volumes.c:3220
lr : btrfs_remove_chunk+0x1378/0x1904 fs/btrfs/volumes.c:3220
sp : ffff8000250c76a0
x29: ffff8000250c7820 x28: 0000000000100000 x27: ffff0000df3e0050
x26: dfff800000000000 x25: ffffffffffffffe4 x24: ffff0000cb4c18f0
x23: ffff700004a18eec x22: 1fffe0001974a220 x21: ffff0000cba51100
x20: 0000000000000000 x19: 0000000000000000 x18: 1fffe0003686bb76
x17: ffff80001583d000 x16: ffff800008304a58 x15: ffff0001b435dbbc
x14: 1ffff00002b080b0 x13: dfff800000000000 x12: 0000000000000003
x11: 0000000000ff0100 x10: 0000000000000003 x9 : 9f20277c9850b500
x8 : 9f20277c9850b500 x7 : ffff80000827c520 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : ffff8000122ac660 x0 : ffff80019ebcc000
Call trace:
 btrfs_remove_chunk+0x1378/0x1904 fs/btrfs/volumes.c:3220
 btrfs_relocate_chunk+0x260/0x368 fs/btrfs/volumes.c:3350
 __btrfs_balance+0x1468/0x1dc8 fs/btrfs/volumes.c:4042
 btrfs_balance+0xa38/0xe40 fs/btrfs/volumes.c:4418
 btrfs_ioctl_balance+0x3e4/0x778 fs/btrfs/ioctl.c:4511
 btrfs_ioctl+0x72c/0xb08 fs/btrfs/ioctl.c:5545
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 69242
hardirqs last  enabled at (69241): [<ffff80000827c5c0>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline]
hardirqs last  enabled at (69241): [<ffff80000827c5c0>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5004
hardirqs last disabled at (69242): [<ffff800012152b84>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (69022): [<ffff800008033064>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (69020): [<ffff800008033030>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
BTRFS info (device loop2: state A): dumping space info:
BTRFS info (device loop2: state A): space_info DATA+METADATA has 1867776 free, is not full
BTRFS info (device loop2: state A): space_info total=3276800, used=61440, pinned=0, reserved=8192, may_use=1339392, readonly=0 zone_unusable=0
BTRFS info (device loop2: state A): space_info SYSTEM has 8253440 free, is not full
BTRFS info (device loop2: state A): space_info total=12451840, used=4096, pinned=0, reserved=0, may_use=0, readonly=4194304 zone_unusable=0
BTRFS info (device loop2: state A): global_block_rsv: size 917504 reserved 913408
BTRFS info (device loop2: state A): trans_block_rsv: size 262144 reserved 262144
BTRFS info (device loop2: state A): chunk_block_rsv: size 0 reserved 0
BTRFS info (device loop2: state A): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop2: state A): delayed_refs_rsv: size 524288 reserved 163840
BTRFS: error (device loop2: state A) in btrfs_remove_chunk:3220: errno=-28 No space left
BTRFS info (device loop2: state EA): forced readonly
BTRFS info (device loop2: state EA): 1 enospc errors during balance
BTRFS info (device loop2: state EA): balance: ended with status: -28

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/18 21:40 linux-6.1.y 8b4118fabd6e 578f7538 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2024/01/10 02:11 linux-6.1.y 38fb82ecd144 b438bd66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2023/12/20 03:26 linux-6.1.y ba6f5fb46511 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
* Struck through repros no longer work on HEAD.